Atherton Bridge

The Atherton Bridge is a historic iron truss bridge in Lancaster, Massachusetts, spanning the South Branch of the Nashua River. It is a rare example of a hybrid pony truss that is similar to the 19th century truss design of Simeon S. Post. It was built by J. H. Cofrode & Co. of Philadelphia in 1870. It was the first iron bridge to be constructed in the town.[2] The bridge was added to the National Register of Historic Places in 1979.

Atherton Bridge
Atherton Bridge, 1979, by Jet Lowe
LocationLancaster, Massachusetts
Coordinates42°26′41″N 71°40′19″W
Built1870
NRHP reference No.79000377[1]
Added to NRHPSeptember 19, 1979

The bridge formerly carried Bolton Road, but was closed to vehicular traffic in 1975 and bypassed by a modern highway bridge in the 1980s. It remained open to pedestrian traffic until April 2020, when a flash flood damaged the bridge's wooden deck and it was closed to all traffic. The long-term future of the bridge is uncertain.[3][4]

Technical information

The Atherton Bridge has iron compression posts that incline inward towards the center of the span and diagonal tension rods that incline outward towards the abutments. Unusual features include double end posts with adjustable turnbuckles, channeled castings to join the lower chord bars, and patented Phoenix columns for all inclined posts. This bridge does not make use of Simeon Post's patented joints. The floor beams support a wood plank deck.

The bridge is 72 feet (22 m) long and 18.5 feet (5.6 m) feet wide, and is composed of eight panels. It rests on granite abutments.

The bridge was photographed in 1979 by Jet Lowe of the Historic American Engineering Record, and documented in 1990 as part of the Massachusetts Historic Bridge Project.[2] At that time, it was one of only two known examples of the Post type of truss still surviving.[5]

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See also

References
  1. "National Register Information System". National Register of Historic Places. National Park Service. April 15, 2008.
  2. Harshbarger, Patrick (August 1990). "Atherton Bridge" (PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress. Retrieved July 19, 2020.
  3. https://historicbridges.org/bridges/browser/?bridgebrowser=massachusetts/atherton/
  4. http://bridgehunter.com/ma/worcester/atherton/
  5. "NRHP nomination for Atherton Bridge". Commonwealth of Massachusetts. Retrieved 2015-10-01.
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